Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first embodiment of a display screen or portion thereof with transitional graphical user interface according to the claimed design;

FIG. 2 is a second image thereof;

FIG. 3 is a front view of a second embodiment according to the claimed design;

FIG. 4 is a second image thereof;

FIG. 5 is a front view of a third embodiment according to the claimed design;

FIG. 6 is a second image thereof;

FIG. 7 is a front view of a fourth embodiment according to the claimed design;

FIG. 8 is a second image thereof;

FIG. 9 is a front view of a fifth embodiment according to the claimed design;

FIG. 10 is a second image thereof;

FIG. 11 is a front view of a sixth embodiment according to the claimed design; and,

FIG. 12 is a second image thereof.

The longer-length broken-line showing of a device and the intermediate-length broken-line showing of a display screen boundary are included for the purpose of illustrating environmental structure and form no part of the claimed design. The remaining broken lines portray elements of the graphical user interface that are excluded from the claim.

The appearance of the transitional image transitions between the images shown in FIGS. 1-2, 3-4, 5-6, 7-8, 9-10, and 11-12. The process or period in which one image transitions to another forms no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described. 